package com.leo.c02;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

/**
 * VM Args：-Xmx20M -XX:MaxDirectMemorySize=10M
 * Created by LEO on 2017/9/4.
 */
public class DirectMemoryOOM {
    private static final int _1MB = 1024 * 1024;

    public static void main(String[] args) throws Exception {
        Field unsafeField = Unsafe.class.getDeclaredFields()[0];
        unsafeField.setAccessible(true);
        Unsafe unsafe = (Unsafe) unsafeField.get(null);
        while (true) {
            unsafe.allocateMemory(_1MB);
        }
    }
}

//这种类型的结果就要考虑直接内存的溢出了
//Exception in thread "main" java.lang.OutOfMemoryError
//at sun.misc.Unsafe.allocateMemory(Native Method)
//        at com.leo.c02.DirectMemoryOOM.main(DirectMemoryOOM.java:19)
